Androecium

The androecium is composed of stamens and represents the male reproductive whorl. Each stamen consists of a stalk or filament and an anther. Each anther is usually bilobed and each lobe has two chambers, the pollen-sacs, in which the pollen grains are produced. A sterile stamen that does not produce pollen is called a staminode.

Stamens of a flower may be united with other members, such as the petals or the perianth, or among themselves:

• Epipetalous — stamens attached to the petals, as in brinjal.
• Epiphyllous — stamens attached to the perianth, as in the flowers of lily.

Based on the cohesion among the stamens themselves, they may either remain free (polyandrous) or be united in varying degrees:

• Monoadelphous — stamens united into one bunch or one bundle, as in china rose.
• Diadelphous — stamens united into two bundles, as in pea. …